I found a Blackberry 9000 for cheap (100) and I want to get it, but its unlocked and I'll be using it on TMobile. I am wondering, will I encounter any problems while using it on T Mobile? I don't care about not being able to use 3G speeds, but MMS and SMS is basically what I will be using this phone for mostly. My old 8800 has about 37000 messages, So I'm a huge text and picture message freak.

I don't know prices, but if you say it is cheap, that to me is a red flag right at the start. Be very careful.

Thankfully its not from Ebay, but rather Craigslist, so I'm going to the guy's house to check out first hand. As for problems, I was referring to maybe issue's like Service Books being an issue, and such.